Wireless apparatus



Jan. 18, w. /A' GRAHAM l WIRELESS APPMA'IUsV Filed Dec. 2, 1920 2Sheets-Sheet 1 OUTPUT PHONES FIL Rneo nvmtoz WLLMN A. GMM

@5 *MWL/ww Jan. 18, 1927. 1,614,524

w. A. GRAHAM WIRELESS APPARATUS Filed Deo. 2, 1920 2 Sheets-Sheet 2 s@wmwOA Panarea im. 1s, 1927.

UNITED STATES 1,614,524 PATENT OFFICE."

WILLIAM A. GRAHAM, l" BBOKLYN, NEW YORK, ASBIGNOB TO RADIO COBPBATION 0FAMERICA, A CORPORATION OF DELAWARE.

WIRELESS APPARATUS.

Application and member 2, i920. seriai no. 427,670.

The present invention relates to an arrangement for estabhshing circuitconnections in a wireless receiving set having a' vacuum tube detectorand the device will be referred to as an adapter for vacuum tubes. Theobject of the invention is to provide a simple inexpensive device whichis compact in form and adapted to permit all vof the usual connectionsto be made quickly and conveniently at considerable saving of time tothe experimenter. The characteristics of the device render it especiallysuitable for amateur and experimental use.

The adapter consists of a portable hollow panel or base adapted to reston a bench, ta-

le, or the like, the base being provided with a number of convenientlylocated binding posts on the exterior for the terminals of variousapparatus of the receiving set. The 2o wiring :isv located in theinterior of the base. A vacuum tube socket and several holders for smallcondensers and a rid leak or other apparatus are also provide 0n theexterior. At one end I rovide a com ression screw for a filament reostat locate in the base of the panel together with a number ofconnections between the various terminals' of the posts, holders andsocket. The structure v combines a number of suitable connections 3o andcertain apparatus usually utilized when l using a vacuum tube as adetector in a wireless receiving set.

The features which are believed to be characteristic of the inventionare set forth with particularity in the appended claims.

The invention,` however, both as to its organization .and method ofoperation, together with the way in which the particular object thereofmay be attained will bestlbe understood b reference to the followingdescription ta en in connection with the accompanying drawing in kwhichFig. 1 is a plan view of the apparatus. Fig. 2 is a cross section of abinding post. Fig. 3 is a detail view of a portion of the device.

l Fig. 4 is a side view of the apparatus.

Fig. 5 is a bottom view and Fig. 6 is a diagrammatic view showing thedevice connected with receiving apparatus.

The panel or'base 1 shown in Fig. 1 consisting of anysuitable insulatingmaterial such as hard rubber or fibre, is hollow and the exterior isprovided with a number of terminals, which may conveniently be bindingosts 2 and clamping nuts 3, encased in har rubber sheaths 4 and 5respectively as shown in Fig. 2 in cross section. The binding postswhich are preferably six in number, 6, 7, 8, 9, 10, 1l, project throughthe base into a cavity which is adapted to contain variousA connectionsto be referred to later. The terminals of the input circuit 12 will beconnected to binding posts 6 and 7 as shown; the terminals of thefilament or A battery 13 are connected to posts 6 and 8; the terminalsof the regenerative or tickler circuit 14 to posts 8 and 10; theterminals of the output or telephone circuit 15 to osts 10 and 11, andthe terminals of the p ate or B battery 16 to posts 9 and 11.

A socket member 17 for the vacuum tube 18 is fitted in an openingpreferably located in the center of the space between binding posts 6,7, 8, 9. In the space between posts 8,'9, 10 and 11 I arrange three setsof terminals 1 9, 20, 21, 22, 23 and 24. The terminals are preferably inthe form of flat spring metal bent into the shape shown in Fig. 3 andhaving openings adapted to form sockets for the reception of smalldevices of the form shown in the figure. In the drawings a bridgecondenser 25 of cartridge form is shown connected across terminals 19,20; across terminals 21, 22 a similar grid leak condenser 26 and acrossterminals 23, 24 a grid leak resistance ofliigh value.

At the end of the panel adjacent the posts 10, 11 for the output phones,I provide a compression screw 27 for a compression rheostat 28 foradjusting the filament current. The compression rheostat as well as allthe connections hereafter described are located in the interior of thehollow base previously referred to. Aconvenient mounting for thecompression rheostat comprising an insulating case 29 of hard rubberattached to the interior of the panel by means of 100 screws 30.Suitable plates 31, 32 adjacent to the opposite ends of the rlieostatare extended to the surface adjacent the edge of the panel, as showndiagrammatically in Fig. 6.`

The bottom of the base is hollow as indicated in dotted lines in Fig.- 4and the hollow space 33 contains various connections which arepreferably permanent. The hol low base and connections may thus be con-110 veniently placed against any surface such as a table or panel boardor the like when in use and may be suitably secured thereto by anywell-known and obvious means, for example by screws, nuts and bolts,etc. A vacuum tube detector of a known type having four terminals ispreferably used with the adapter and connections are made therewith bymeans of four contact strips 34, 35, 36, 37 located in the hollow spaceat substantially right angles to each other. As shown in Fig. 6 each ofthe contact strips is fitted over a projecting end of a binding post.Contact strip 34, which is adapted to make contact with one iilamentterminal of the vacuum tube, is electrically connected to post 6 andcontact 36 which is adapted to make connection with the other filamentterminal is fitted on post 8 but insulated therefrom in any suitablemanner. Contact 35 which connects with the grid terminal of the tube ismounted on ost 7 but insulated therefrom and the tourt 1 contact strip37 which contacts with the plate electrode terminal of the tube ismounted in post 9 and electrically connected thereto. Each of thecontact strips is retained on the respective posts by means of a nutthreaded thereon.

A strip 38 electrically connects post 9 to a screw 20 used for fasteningthe clip 20 to the base and a second strip 39 connects screws 22', 24which fasten the clips 22, 24 to the base.y

Insulated wire leads in the interior of the hollow base are used to makethe following connections; lead 39 between post 6 and fastening screw 23of clip 23; lead 40 between spring contact 36 and rheostat plate 31;lead 41 between fastening screw 19 of clip 19 and binding post 10; lead42 between post 8 and rheostat plate 32; lead 43, between post 7 andstrip 39; and lead 44 between spring cpntact 35 and fastening screw 21lof spring c ip 21.

By reference to Fig. 6 it will be noted that by means of the adapterdevice described I provide a simple arrangement containing all theconnection for a three electrode vacuum tube and the amateur orexperimenter need onlf connect various apparatus referred to irectly tothe binding post, the number of which are reduced to a minimum.

I claim:

1. A rheostat socket comprising a base adapted to receive a tube, arheostat element combined therewith for varying the amount of currentsupplied to said tube, and a movable clamping element adapted to locksaid rheostat element in place.

2. An adapter for establishing circuit connections between a vacuum tubeand a wireless set comprising a hollow base, a socket for the vacuumtube on the exterior 0f the base, a plurality of contacts for the vacuumtube located in the hollow interior of the base, a plurality ot bindingposts on the exterior of the base adapted to receive the terminals ofthe circuits ot the wireless set, an adjustable rheostat mounted in thehollow interior of the base, adjusting means for the rheostat on theexterior of the base, and connections in the hollow interior ot' thebase for suitably connecting the contacts and binding posts forestablishing circuit connections between the electrodos of the tube Vandcircuits ot said wireless set.

o. An adapter for establishing circuit connections between avacuum tubeand a wireless set comprising a hollow base, a socket l'or the vacuumtube on the exterior of the base, a plurality of contacts for the vacuumtube located in the hollow interior of the base, a plurality of bindingposts on the exterior of the base adapted'to receive the terminals ofthe circuits ot' the Wireless set, a plurality of cartridge retainingclips on the exterior of the base having terminals extending into theinterior and connections in the hollow interior of the base for suitablyconnecting the contacts, clips and binding posts for establishingcircuit connections between the electrodes of the tube and circuits ofsaid wireless set.

4. An adapter for establishing circuit connections between athree-electrode vacuum tube and a wireless set comprising a hollow base,a socket-for the vacuum tube on the exterior of the base, a contact forthe grid of the tube, a contact for the plate electrode of the tube, apair of contacts for the filament terminals, said contactsbeing locatedin the hollow interior of the base, a binding post connected to theplate electrode contact, a second binding post connected to one of thefilament contacts, a third binding post connected to the other filamentcontact, a fourth binding post connected to the grid contact, a pair ot'binding posts for a telephone rcceiver adapted to be connected to theplate electrode contact land one of the filament contacts, all of saidbinding posts being located on the exterior ot' the base, a rheostatmounted on the interior of the base and connected between the filamentcontacts and con nections in the hollow interior of the base forsuitably connecting the binding posts and contacts for establishingcircuit connections between the electrodes of the tube and the circuitsof the wireless set.

5. An adapter for establishing circuit connections between athree-electrode vacuum tube and a wireless set comprising a hollow base,a socket for the tube on the exterior of the base, a contact for thegrid terminal of the tube, a second -contact for the plate electrodeterminal and a air of contacts for the filament terminals, a inding poston the panel connected to the second contact, a secbinding post.

lond binding post connected to one of the filament contacts, a thirdbinding post connected to the other filament contact, a fourth binding'post connected to the grid terminal contact, a pair of binding oSts fora telephone recelver adapted to connected to the plate electrode contactand one of the filament terminal contacts, all said binding posts beinlocated on the exterior of the ase and t e connections on the interiorof the base, and a pair of terminals on the exterior of the base adaptedto support a condenser therebetween and connections in the interior ofthe base for connecting the termiminals with the grid contact and thefourth 6. An adapter for establishing circuit connections between athree-electrode vacuum tube and a wireless set comprising a hollow basea socket for the tube on the exterior of the base, -a contact for thegrid terminal of the tube, a second contact for the plate electrodeterminal and a pair of contacts for the filament terminals, a bindingpost on thev panel connected to the second contact, a second bindingpost connected to one of the filament contacts, a third binding postconnected to the other filamenty contact, a fourth binding post'connected to the grid terminal contact, apair of binding posts for atelephone recelver adapted to be connected to the plate electrodecontact and one of the filament terminal contacts, the binding postsbeing located on the exterior and the connections" on the interior ofthe base, a palr of terminals mounted on the exterior of the baseadapted to support a condenser, connections in the interior of the basebetween the grid contact and the fourth binding post and a secondpair ofterminals mounted on the exterior of the base adapted to support a highresistance grid leak, and connections for shuntin said last mentionedterminals across t 1e grid condenser.

7. An adapter for establishing circuit connections between athree-electrode vacuum tube and a wireless set comprisinga hollow base asocket for a tube on the exterior of the base, a contact for the gridterminal of the tube, a second contact for the plate electrode terminaland a pair of contacts for the filament terminals a binding post on thepanel connected to the second contact, a second binding post connectedto one of the filament contacts, a third binding post connected to theother filament contact, afourth binding post connected to the gridterminal contact, `a pair of binding posts for a telephone receiveradapted to be connected to the plate electrode contact and one of thefilament terminal contacts, all of said binding posts` being located onthe exterior and thev connections on the interior of the base, a pair ofterminals mounted on the exterior of the basejadapted to support acondenser, the terminals of said socket being shunted across yone of thebinding posts for the telephone and the plate `electrode terminalcontact, a second pair of terminals mounted on the exterior of the baseadapted to support a second condenser, said terminals being connectedbetween the grid contact and thc fourth binding post, and a third pairof terminals mounted on the- .exterior of the base adapted to support ahigh resistance l rid leak, the terminals of said socket being 1n shuntwith the second condenser.

W. A. GRAHAM.

